[EN]The following development project, focused in the context of supplying the needs of the emergency teams, is presented. Nowadays, emergency teams use walkie-talkies to communicate, in other words, they use PTT (Push-to-talk) technology. Is a unidirectional communication, from one user to many, making it possible to transmit all the necessary information to various users simultaneously. On the other hand, the use of this technology, provides communication in real-time with practically no delay.
However, the use of it brings its own inconvenients. For example, the range of transmission-reception of these devises is limited. Also, the frequency band, needs to be reserved in order to avoid the channel to be occupied by other users, possible interferences, etc. The reservation of this frequency range is an added cost for the use of this technology.
With the development of mobile networks that offer high transmission speed, it is possible the use of the PTT technology through the existing mobile network. Thus, the following development project of a mobile application Android, as a client that uses the PTT technology over the mobile network PoC (Push -to-talk Over Cellular) arises.